I'm happy your son got back from Europe. As parents we worry about our kids in the best of circumstances, throw in a health issue and we have our work cut out for us.
I don't know if you've had a chance to read this.
http://valvereplacement.com/forums/showthread.php?t=17116 It's just a quick overview of some basic questions and concerns people have in relation to Coumadin, put together by some of us that have used the drug for a while.
My blood pressure is regularly 100/70. Some people just generally run low bp's. My guess on the nurse worrying about him having internal bleeding is more due to the nurse operating off old myth or incorrect information about warfarin.
Innercalm said:
Coumadin is a blood thinner, as you know, and an internal bleed is possible even in the best circumstances.
Unfortunately, one of the big erroneous assumptions is that people on warfarin (Coumadin) can just start bleeding spontaneously without any cause or condition. The vast majority of other-wise healthy people with an INR less than 5 (and that's being conservative) are not going to start bleeding for no reason. And even if there are reasons, the bleeding is not going to be something that endangers them of bleeding out.
Now if your son has a history of ulcers or other similar issues, then maybe internal bleeding might be of a little more interest when a low bp is taken. But even then, I would think that the amount of bleeding needed to cause a lower bp would also cause some other symptoms, such as abodominal pain. But for a nurse to take a low bp on a patient in for a thyroid check and quickly go to a concern of internal bleeding just tells me the nurse isn't up-to-speed on warfarin.